visit(callback)

Iterates all cells in row-major order and calls callback({ row, col, value }) for each. Return false from the callback to stop early. Reading and mutating the grid inside the callback is allowed.

Example

(click to randomly refill q with emojis)

code

Quadrille.cellLength = 50;
let q;
const emojis = ['🐸', '🐯', '🐱', '🐶', '🐮'];

function setup() {
  createCanvas(8 * Quadrille.cellLength, 8 * Quadrille.cellLength);
  q = createQuadrille(8, 8);
  update();
}

function draw() {
  background('#DAF7A6');
  drawQuadrille(q);
}

function mousePressed() {
  update();
}

function update() {
  q.visit(({ row, col }) => q.fill(row, col, random(emojis)));
}

All cells are visited in row-major order.
The callback decides what to do with each cell (e.g., refill with a random emoji).

Syntax

visit(callback)

Parameters

Param	Description
`callback`	Receives `{ row, col, value }`. Return `false` to stop early; any other return is ignored

visit(callback, collection)